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Author Topic: Lens size? Scott Balko Expert Film Handler Posts: 136 From: Redwood Falls, Minnesota, USA Registered: Apr 2000 posted 07-22-2002 04:29 PM                     I have a five inch primary lens on my scope lens. It's a kollmorgen Super Snaplite and it's a piece of . Can anyone tell me what the metric equivalent is so Brad can see if he has one that I can buy? And in the event that he doesn't, would anyone else have an Isco lens of this size for me? Thanks  |  IP: Logged Adam Martin I'm not even gonna point out the irony. Posts: 3686 From: Dallas, TX Registered: Nov 2000 posted 07-22-2002 04:35 PM                     5 inches is 127mm. Having said that, I would turn around and use Schneider's lens calculator to make sure I was purchasing the right size for my particular application. It's in the Manuals section under "Miscellaneous Programs".  |  IP: Logged Darren Briggs Master Film Handler Posts: 371 From: York, UK Registered: Dec 2001 posted 07-22-2002 05:07 PM                        In other words, get the following measurements. Projection throw, from projector gate to screen. The scrren height and width. Calculate yourself the lens size with the lens calculator program and then give the same details to the lens supplier so they can re-calculate to confirm the correct lens size. Ive known of 2 cinemas who have got new lenses and the projection throw distance was 3 foot out and they ordered the lens, it was of course very wrong! Darren  |  IP: Logged Rob Jones Film Handler Posts: 44 From: Swindon, Wiltshire, United Kingdom Registered: Jun 2001 posted 07-23-2002 03:25 PM                        That wouldn't be the one just down the road from you Darren would it? And that was after they gave the measurements to a 3rd party. Another rule I ought to add - when measuring the throw recommend people use some kind of laser/some light source measuring device or get the plans for the building out rather than relying on ceiling tiles and a long piece of string!  |  IP: Logged Darren Briggs Master Film Handler Posts: 371 From: York, UK Registered: Dec 2001 posted 07-24-2002 03:29 PM                        Rob, I was actually thinking of Oak House at pocklington where the building plans were wrong, but now you mention the place down the road seem to of done the same thing! lol Have fun at Dolby rob and don't forget my off the back of a lorry MPU 1! (I dont mind paying really!) Speak soon Darren  |  IP: Logged

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